Fabrication of Multi-Functional Sintered Materials with Graded Compositional Distribution

具有梯度成分分布的多功能烧结材料的制造

• 批准号: 03453064
• 负责人: WATANABE Ryuzo
• 金额: $ 4.42万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453064/
• 关键词: Functionally gradient materials; Sintered materials; Composite materials; Material design; Thermomechanical properties; Thermal residual stress; Microstructual connectivity; Ductile; brittle transition; SiC; AlN; セラミックス固溶体; バーナー加熱試験; 熱応力緩和機能

A laser beam differential temperature heating test and a hydrogen/oxygen burner flame heating test were made on the graded specimens of metal and ceramics, fabricated under the design scheme established in the forgoing two years. An acoustic emission monitoring was used to detect the crack formation in the specimen during heating and cooling cycle. Vertical cracks were observed to be formed during cooling cycle of testings. The vertical cracks propagated by further heating and cooling, and they eventually coalesce to result in the spallation of the ceramic layr from specimen surface. Finite element analysis on the stress state in the specimen was done using the measured temperature distribution, and it has shown that a large compressive stress is generated during heating period at the ceramic surface to cause non-elastic deformation of the ceramic layr. The non-elastic deformation will cause during cooling peiod tensile stress, which will exceed the intrinsic strength of the ceramics and result in the formation of the vertical cracks. From the microstructural observations of the crack propagation in the composite structures consisted of metal and ceramic phase the improvement of the ductility of the ceramic-rich regions has been found to be indispensible for the retention of the heat resisrtance of this kind of functionally gradient materials. Such an improvement will be realized by an control of the connectivity of the metal phase in the ceramic-rich region through a process optimization. The heat insulating performance is evaluated by thermal resistance of the material, and its value is a characteristic parameter, along with the heating temperature of the vertical crack formation, for the thermomechanical performance of functionally gradient materials. The concept of the microstructual control of graded materials, particulary with respect to the connectivity of the phases involved, will be applied to the other kind of functionally gradient materials, such as ther

对按前两年确定的设计方案制作的金属和陶瓷梯度试样进行了激光差温加热试验和氢氧燃烧器火焰加热试验。声发射监测被用来检测在加热和冷却循环过程中的试样中的裂纹形成。在试验的冷却循环过程中观察到垂直裂纹的形成。垂直裂纹在进一步加热和冷却过程中扩展，并最终合并，导致陶瓷层从试样表面剥落。利用测得的温度分布对试样的应力状态进行了有限元分析，结果表明，在加热过程中，陶瓷表面产生了较大的压应力，使陶瓷层产生非弹性变形。在冷却过程中，陶瓷的非弹性变形会产生拉应力，超过陶瓷的本征强度，导致纵向裂纹的形成。从金属-陶瓷相复合结构中裂纹扩展的显微组织观察发现，提高富陶瓷区的塑性是保持这类梯度功能材料热导率的必要条件。通过工艺优化控制富陶瓷区域中金属相的连通性将实现这种改进。隔热性能是通过材料的热阻来评价的，其值是梯度功能材料热机械性能的特征参数，沿着垂直裂纹形成的加热温度。梯度材料微观结构控制的概念，特别是有关相连接性的概念，将适用于其他类型的功能梯度材料，如

项目成果

Ryuzo WATANABE,Akira KAWASAKI,Jing-Feng LI: "Fabrication of SiC-AlN/Mo Functionally Gradient Material for High Temperature Use" Plansee Seminar'93,(Proceedings of the 12th International Plansee Seminar,Reutte,Tirol,Austria). 5. 24-28 (1993)

Ryuzo WATANABE、Akira KAWASAKI、Jing-Feng LI：“高温用 SiC-AlN/Mo 功能梯度材料的制造”攀时研讨会 93，（第 12 届国际攀时研讨会论文集，罗伊特，蒂罗尔，奥地利）。

Akira KAWASAKI, Ryuzo WATANABE: "[Thermal Shock Fracture Mechanism of Material/Ceramic Functionally Gradient Materials]" Thermal Shock and Thermal Fatigue Behavior of Advanced Ceramics. G.Schneider and G.Perzow(Eds.), Kluwer Academic Publishers. 509-520 (

Akira KAWASAKI、Ryuzo WATANABE：“[材料的热冲击断裂机理/陶瓷功能梯度材料]”先进陶瓷的热冲击和热疲劳行为。

R.Watanabe and A.Kawasaki: "Design,Fabrication,and Evaluation of Functionally Gradient Material for High Temperature Ues" Mechanics and Mechanisms of Damage in Composites and MultiーMaterials,Ed.D.Baptiste,Mechanical Engineering Publications Limited,London

R. Watanabe 和 A. Kawasaki：“高温用途的功能梯度材料的设计、制造和评估”复合材料和多材料损伤的力学和机制，D. Baptiste 编，机械工程出版有限公司，伦敦

Akira KAWASAKI,Ryuzo WATANABE: "Thermal Shock Fracture Mechanism of Metal/Ceramic Functionally Gradient Materials" Thermal Shock and Thermal Fatigue Behavior of Advanced Ceramics:(1993),G.Schneider and G.Petzow(eds.),Kluwer Academic Publishers. 509-520 (1

Akira KAWASAKI，Ryuzo WATANABE：“金属/陶瓷功能梯度材料的热冲击断裂机制”先进陶瓷的热冲击和热疲劳行为：（1993），G.Schneider和G.Petzow（编辑），Kluwer学术出版社。

Ryuzo WATANABE, Akita KAWASAKI, Jing-Feng LI: "[Fablication of SiC-AlN/Mo Functionally Gradient Material for High Temperature Use]" Plansee Seminor '93 (Priceedings of the 12th International Plansee Seminor, Reutte, Triol, Austria). 5. 24-28 (1993)

Ryuzo WATANABE、Akita KAWASAKI、Jing-Feng LI：“[用于高温用途的 SiC-AlN/Mo 功能梯度材料的制作]”攀时研讨会 93（第 12 届国际攀时研讨会的价格，奥地利罗伊特）。